$$ list.tpl
$$
$$ 列表函数库模板
$$

statement: 连接 {a} {b} ->
(cons {a} {b})

statement: {a} 的头 ->
(car {a})

statement: {a} 的尾 ->
(cdr {a})

statement: {a} 的第三个值 ->
(third {a})

statement: {a}的拷贝 ->
(copy-list {a})

statement: 创建列表 [{a}]+ ->
(list [{a}]+)

statement: 添加列表[{a}]+ ->
(append [{a}]+)

statement: {列表}的第{n}个元素 ->
(nth {n} {列表})

statement: {列表}的第{n}个尾 ->
(nthcdr {n} {列表})

statement: {列表}的最后一个元素 ->
(last {列表})

